Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun cryptography, dated Any predictable facet of the Enigma Machine cipher due to operator error or laziness, whose existence helped the Allies to break the code.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Uncertain; possibly a pun on silly and the letters CIL used as a cryptographic key.

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